Navigational aid



FIG. 1 is a front elevational view of a navigational aid showing my newdesign, the rear elevational view being flat, plain and unornamented;

FIG. 2 is a right side elevational view, the left side elevational viewbeing a mirror image;

FIG. 3 is a top plan view; and

FIG. 4 is a bottom plan view thereof.

The ornamental design for a navigational aid, as shown and described.